package com.ydgk.servlet;

import com.ydgk.bean.Admin;
import com.ydgk.dao.AdminDao;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

@WebServlet(name = "UpdateAdminServlet", urlPatterns = "/UpdateAdminServlet.action")
public class UpdateAdminServlet extends HttpServlet {
    // 上传文件存储目录
    private static final String UPLOAD_DIRECTORY = "upload";
    // 上传配置
    private static final int MEMORY_THRESHOLD   = 1024 * 1024 * 3;  // 3MB
    private static final int MAX_FILE_SIZE      = 1024 * 1024 * 40; // 40MB
    private static final int MAX_REQUEST_SIZE   = 1024 * 1024 * 50; // 50MB
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Admin admin = new Admin();
        AdminDao adminDao = new AdminDao();
        ServletContext application = request.getServletContext();
        PrintWriter out = response.getWriter();
        HttpSession session = request.getSession();
        // 检测是否为多媒体上传,如果没有就不用做后续的处理了
        if (!ServletFileUpload.isMultipartContent(request)) {
            // 如果不是则停止
            out.println("<script>alert('Error: 表单必须包含 enctype=multipart/form-data');window.history.back();</script>");
            out.flush();
            return;
        }

        // 配置上传参数
        DiskFileItemFactory factory = new DiskFileItemFactory();

        // 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
        factory.setSizeThreshold(MEMORY_THRESHOLD);

        // 设置临时存储目录
        factory.setRepository(new File(System.getProperty("java.io.tmpdir")));

        //ServletFileUpload就是用户获取用户提交上来的文件信息,还有表单中的文本信息
        ServletFileUpload upload = new ServletFileUpload(factory);

        // 设置最大文件上传值
        upload.setFileSizeMax(MAX_FILE_SIZE);

        // 设置最大请求值 (包含文件和表单数据)
        upload.setSizeMax(MAX_REQUEST_SIZE);

        // 中文处理
        upload.setHeaderEncoding("UTF-8");

        // 构造临时路径来存储上传的文件
        // 这个路径相对当前应用的目录
        String uploadPath = application.getRealPath(UPLOAD_DIRECTORY)  ;

        // 如果目录不存在则创建
        File uploadDir = new File(uploadPath);
        if (!uploadDir.exists()) {
            uploadDir.mkdirs();//建upload文件
        }

        try {
            //将request对象进行转换.,转换成FileItem集合
            List<FileItem> list = upload.parseRequest(request);
            for (FileItem fileItem : list) {
                //isFormField()如果是true就是普通文本内容,如果是false的话就是要上传的文件
                if( fileItem.isFormField() ){
                    //文本处理
                    String value = fileItem.getString("utf-8");
                    //System.out.println(fileItem.getFieldName()+":"+value);
                    BeanUtils.setProperty(admin,fileItem.getFieldName(),value);
                }else{
                    if(fileItem.getSize() > 0) {
                        //文件上传
                        String fileName = fileItem.getName(); //上传的文件名字

                        int index = fileName.lastIndexOf(".");
                        String newfilename = Math.random() + fileName.substring(index);

                        //c:/xxx/xxx/xxx/xxx/upload/123. gif
                        File f = new File(uploadPath + "\\" + newfilename);
                        // 保存文件到硬盘
                        fileItem.write(f);//文件写入

                        //保存到数据库的图片路径是相对路径,不能用绝对路径
                        admin.setAphoto(UPLOAD_DIRECTORY + "/" + newfilename);
                    }
                }
            }

            if(admin.getAid()>0){
                Admin newAdmin = adminDao.findById(admin.getAid());
                if(!admin.getAphoto().equals(newAdmin.getAphoto())){
                    new File(application.getRealPath("/"+newAdmin.getAphoto())).delete();
                }
                adminDao.updateById(admin);
            }else{
                adminDao.save(admin);
            }
            System.out.println(session.getAttribute("admin"));
            if(!session.getAttribute("admin").equals(admin)){
                session.setAttribute("admin",admin);
            }
            System.out.println(session.getAttribute("admin"));
            request.getRequestDispatcher("admin.jsp").forward(request,response);
        } catch (FileUploadException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


}
